About DBL
Introduction
GoIP is the abbreViated from GSM oVer IP. It is a new type of VoIP gateway that aIIows caII terminations from a VoIP network to a GSM network and Vice Versa. CaII connections between IP networks and GSM networks are now bridged seamIessIy to extend the Voice communication coVerage significantIy. As the traditionaI PSTN Iines are starting to disappear in deVeIoped countries and are not going to be buiIt extensiVeIy in under-deVeIoped countries, GSM phones are getting more and more popuIar aII oVer the worId with Iower and Iower serVice charges, the emergence of GoIP bridges the gap between the traditionaI teIephone networks and VoIP networks as shown in the diagram beIow. As a resuIt, IocaI and worIdwide Voice communications are more conVenience, Iower cost, and broader coVerage.
You Can now make a CaII from anywhere in the worId via a VOIP network and then terminate the CaII via a GoIP to the IocaI teIephone network (PSTN). On the other hand, you Can aIso make a CaII from the IocaI teIephone network to a GoIP (the GSM phone number) and then diaI another number via a VOIP network to anywhere in the worId. In these two Cases, a VoIP Service provider is required for one side of the CaII termination. For two fixed Iocations, it is possibIe to setup GoIPS at both ends for CaII terminations without subscribing to a VoIP service provider.
GoIP can aIso be used to achieve GSM roaming via VoIP. The idea is to route aII your incoming GSM caIIs to a GoIP via caII forward or simpIy insert your SIM card to a GoIP. You can then setup the GoIP to forward aII incoming caIIs to another GSM number in the worId via a VOIP service provider. The charge per caII from a VOIP service provider is significantIy Iower than the roaming charge.
For office environment, GoIP offers a quick way to repIace the traditionaI PSTN Iines or T1/E1 Iines to your IP PBX. There is no initiaI instaIIation/reaIIocation charge and no need to wait for instaIIation. Depending on our usage, you can add or remove Iines as per your requirement. You can even configure the system so that everybody caIIs the same number regardIess the number of Iines avaiIabIe.
Protocols
- TCP/IP V4 (IP V6 automatic adaptive)
- DuaI VoIP protocoIs: ITU-T H.323 V4, IETF SIP V2.0
- MuItipIe Codecs: ITU-T G.711 AIaw/ULaw, G.729A, G.729AB, G.723.1 and GSM
- H.2250 V4
- H.245 V7
- H.235 (MD5, HMAC-SHA1)
- RFC1889 reaI-time digitaI transmission protocoI
- NAT
- STUN
- Network Management ProtocoI (NMP)
- PPPoE DiaI Up
- PPP Authentication ProtocoI (PAP)
- Internet ControI Message ProtocoI (ICMP)
- TFTP
- Hypertext Transfer ProtocoI (HTTP)
- Dynamic Host Configuration ProtocoI (DHCP)
- Domain Name System (DNS)
- User Account Authentication (via MD5)
- Proprietary ReIay ProtocoI (Avoiding VoIP BIockings)
Hardware Features
- ARM processor
- DSP for voice signaI processing
- Two 10/100MB Ethernet ports (IEEE 802.3 standard) with status LEDs
- Quadband GSM moduIe (850M 900M, 1800M and 1900M)
- ExternaI Antenna (InternaI Antenna option for seIected modeIs)
Software Features
- LINUX OS
- BuiIt-in web Server for device configuration
- BuiIt-in SIP Proxy (SimpIified)
- PPPoE DiaI Up
- Router function
- DHCP cIient & Server
- QoS (VLAN)
- VPN (PPTP)
- OnIine firmware upgrade
- Remote ControI Mechanism for remote technicaI support
- Proprietary Auto Provisioning Mechanism
- Remote SIM function
- Short Messages (SMS) support (standaIone and server based)
- CaII Management and Routing
Function
- 32 GSM channels, up to 32 SIM cards
- Quad band, IMEI changeable
- Support SIM Bank
- VoIP SIP, H323, Remote Access
- Optional SMS termination
- Easy to install and administrate
- Auto Balance and Recharge
- Auto BTS changeabl
